DE102017001970A1 - filter means - Google Patents

Abstract

A filter device having a filter housing (1) with a fluid inlet (13) for unfiltered and with a fluid outlet (3) for filtrate and at least one in the filter housing (1) received one or more parts filter insert (5, 7), with at least one Backwash (21) is cleanable in countercurrent to the filtration direction, by means of a fluid-carrying drive shaft (23) of a rotary drive (35) on the inside (19) of the respective filter insert (5, 7) is movable and at its inner side (19) adjacent end a slot-shaped passage opening (36) which runs parallel to the axis of rotation of the drive shaft (23) and which opens into a fluidically connected to the drive shaft (23) flow space (41; 57; 67) extending in a plane in which the passage opening (39), at least partially continuously tapering in the direction of the drive shaft (23), is characterized in that in a further plane transverse to the one Level the flow space (41; 57; 67) extends at least partially continuously starting from the passage opening (39) in the direction of the drive shaft (23).

Description

The invention relates to a filter device having a filter housing with a fluid inlet for unfiltered and with a fluid outlet for filtrate and at least one housed in the filter housing one or more parts filter insert, which can be cleaned with at least one backwash in countercurrent to the filtration direction, by means of a fluid-carrying drive shaft of a Rotary drive on the inside of the respective filter insert is movable and at its inner side adjacent the end has a gap-shaped passage opening which is parallel to the axis of rotation of the drive shaft and which opens into a fluid-conducting connected to the drive shaft flow space, which is in a plane in which the passage opening is at least partially continuously tapered in the direction of the drive shaft.

For the operational safety and service life of internal combustion engines, the perfect condition of the lubricating oil is of great importance. In particular, the continuous operation of diesel engines, which are operated for example in maritime applications with heavy oil, particularly high demands on the nature of the lubricating oil, so that in such applications the use of filter devices for lubricating oil purification is essential. In this regard, it is state of the art to use filter devices in which filter cartridges are backwashed to allow longer run times between the change of filter cartridges and thereby to keep maintenance costs low. As an example of the related art, the document shows DE 34 43 752 A1 a filter device of the above type.

The efficiency of the cleaning depends in devices of this type to a large extent from the course of the backwash flow, which is at the available at the gap-shaped passage opening pressure difference through the flow space to the fluid-carrying, d. H. hollow, drive shaft extends. The effective at the backwash at the gap of the passage opening pressure difference, which is 1.5 bar at the ambient pressure leading drive shaft and generated by system pressure backwash, for example, should allow the highest possible inlet velocity at the gap and the highest possible backwash volume. In order to come closer to this goal, the known, known filter device provides for a reduction of the flushing cross-section effective during the backwashing process in such a way that the backflushing process is divided into only one of two backflushing devices. For this purpose, the known filter device has a control device which controls the alternating operation of the backwashing by the division of the sludge discharge to two flushing connections, each of which is fluid-carrying connected to a respective backwash. Such a division of the sludge outlet, wherein a valve device must be provided at each flushing connection, at least partially nullifies the advantages of the favorable cleaning effect. In addition, in this design, the risk of clogging of the sludge outlet by deposits, especially in the valve means to the flushing connections.

Based on this prior art, the invention has the object to provide a filter device of the type mentioned is available, which is characterized by a particularly effective Abreinigungswirkung in a simple design.

According to the invention this object is achieved by a filter device having the features of claim 1 in its entirety.

According to the characterizing part of claim 1, a significant feature of the invention is that in a further plane which extends transversely to the one plane in which the passage opening lies, the flow space, at least partially continuously expanded starting from the passage opening in the direction of the drive shaft , Due to this extension, the flow space forms a kind of diffuser. This leads to a reduction of the pressure loss and thus to maximize the backwashing volume flow and the inlet velocity at the gap of the passage opening. In the immediate vicinity of the gap on the filter material, this results in a particularly effective cleaning. The elimination of valve devices, as provided by the said known solution, also ensures a particularly safe performance with a simple design of the device.

Advantageously, the flow space in the one plane can continuously taper in the manner of an inflow funnel.

• – eine Begrenzungswand des Einströmtrichters schräg verlaufend und eine weitere Begrenzungswand eben verlaufend,
• – zwei Begrenzungswände schräg und geradlinig verlaufend,
• – zwei Begrenzungswände mit parabelförmigem Verlauf und
• – eine Begrenzungswand schräg und geradlinig und die weitere Begrenzungswand kurvenförmig verlaufend ausgebildet sind.

In particularly advantageous embodiments, the arrangement may be such that, starting from the gap-shaped passage opening, in the one plane at least

• A boundary wall of the inlet funnel running obliquely and a further boundary wall running smoothly,
• Two boundary walls sloping and rectilinear,
• - two boundary walls with a parabolic course and
• - A boundary wall obliquely and rectilinearly and the other boundary wall are formed curved.

In embodiments in which, in the direction of the fluid connection of the flow space to an internal fluid guide of the drive shaft, the respective flow space with its boundary walls merges into a tubular or channel-shaped section in which the boundary walls have a straight course, the result is a particularly homogeneous velocity profile of the backwash volume flow.

With respect to the expansion of the flow space in the direction transverse to the gap of the passage opening direction, the arrangement may be advantageously made so that widened in this further level of the flow space of the gap-shaped passage opening in the direction of the internal fluid guide of the drive shaft conically with rectilinear boundary walls ,

In advantageous embodiments, the flow space at its exit from the backwashing in the direction of the respective filter insert at least a rounding on the boundary walls of the gap-shaped passage opening, which is parallel to the axis of rotation of the drive shaft. The rounding forms a kind of control surface along the accumulated particles, which start at the rotational movement of the backwash, are guided along the rounding to the input area of the rinsing gap, where due to the high inlet velocity, the maximum separation force is effective.

With an area ratio of column inlet to channel outlet, which is in the range of 0.2 to 2.0, preferably 0.3 to 1.0, results in a sludge downflow favoring, homogeneous velocity profile of Rückspülvolumenstroms.

Preferably, the extent of the gap-shaped passage opening from the height to its width is in the range of 10 to 100, preferably in the range of 30 to 70.

Particularly advantageously, the ratio of the width of the gap-shaped passage opening to the free diameter of the tubular or channel-shaped section, which forms the transition point to the internal fluid guide of the drive shaft, is between 0.05 to 0.5.

In particularly advantageous embodiments, wing-like flow guide bodies are mounted within the flow space, which extend at least partially away from the gap-shaped passage opening in the direction of the channel exit.

Preferably, at least parts of the flow guide have a curved or straight course and extend continuously between the boundary walls of the backwash, which extend parallel to the axis of rotation of the drive shaft.

A particularly favorable flow profile can be achieved if at least one flow guide element protrudes further from the gap-shaped passage opening into the flow space than at least one further flow guide body, wherein the further projecting flow guide body preferably lies in the middle of the gap opening of the passage opening from the latter in the direction of the interior of the flow space extends away. Advantageously, in this case, the fluid guide within the flow space from the gap inlet to before the channel outlet without deflection of the total flow of the backwash.

Preferably, the respective backwash element with its one free end face, which faces the inner wall of the assignable filter insert, passes without clearance past this inner wall by means of the rotatable drive shaft.

In particularly advantageous embodiments, backwashing elements used are used interchangeably in an associated receiving housing, which is arranged on the drive shaft. With the same construction of drive shaft and associated rotary drive can thereby adapt the device to the respective conditions of use, in housings on the drive shaft whose number corresponds to the number of filter cartridges, a desired number of Rückspülorganen are used, the number and flow space geometry is in turn freely selectable.

• – in mindestens zwei Gruppen zusammengefasst an verschiedenen Umfangspositionen an der Antriebswelle, vorzugsweise zu deren Drehachse diametral einander gegenüberliegend,
• – in einer Gruppe ausschließlich auf einer Seite der Antriebswelle liegend, oder
• – in alternierender Reihenfolge auf gegenüberliegenden Seiten der Antriebswelle angeordnet sind.

In this way, the arrangement can be made such that a plurality of backwash elements are inserted in superposition along the drive shaft, wherein these

• - In at least two groups summarized at different circumferential positions on the drive shaft, preferably diametrically opposite to each other the axis of rotation,
• - In a group lying exclusively on one side of the drive shaft, or
• - Are arranged in alternating order on opposite sides of the drive shaft.

The invention with reference to embodiments shown in the drawings will be explained in detail. Show it:

1 a schematically simplified longitudinal section of an embodiment of the filter device according to the invention;

2 a vertical section of the flow space of a single backwash member of the embodiment of 1 ;

3 a horizontal section of the flow space of the backwash of 2 ;

4 in greatly enlarged representation the in 3 area designated IV;

5 a simplified schematic vertical section of a second embodiment of the filter device according to the invention;

6 a vertical section of the flow space of a single backwash member of the embodiment of 5 ;

7 a horizontal section of the flow space of 6 ;

8th a comparison with a practical embodiment reduced drawn perspective oblique view of a single backwash of the embodiment of 5 ;

9 a drawn approximately in natural size vertical section of the backwash of 8th ;

10 and 11 an end view and rear view of the backwash of 8th and 9 ;

12 a horizontal section of this backwash member;

13 and 14 a vertical section or horizontal section of the flow space of a single backwash member according to a third embodiment;

15 a simplified schematic vertical section of a fourth embodiment of the filter device according to the invention;

16 a vertical section of a filter cartridge of the embodiment of 15 used backwash element;

17 as a modification to the embodiment of 15 and 16 in vertical section formed by insert body backwashing, inserted into a receiving housing;

18 an oblique perspective view of a receiving body for four formed by a respective insert body backwashing, wherein an insert body is shown prior to insertion;

19a to 19c graphical representations of examples of possible height distributions inserted backwash organs; and

20a to 20c sketchy representations of three possible distributions of backwash organs over the circumference of respective filter cartridges.

In 1 in which an embodiment of the filter device according to the invention is shown, a filter housing as a whole with 1 designated. At the circular cylindrical filter housing 1 is a fluid outlet on the side 3 arranged for filtrate. In the filter housing 1 are arranged one above the other an upper filter cartridge 5 and a lower filter cartridge 7 taken, which are traversed during the filtering process from the inside out, the unfiltered two filter cartridges 5 and 7 from a lower entrance side 9 can be supplied. The entrance side 9 is an input filter 11 upstream as a pre-filter, over which the unfiltered from an unfiltrateingang 13 can be supplied. For maritime use is the input filter 11 intended as a so-called fish sieve.

For cleaning off deposits on the filter material 19 from upper filter element 5 and from the bottom filter element 7 in backwash operations are for the upper filter cartridge 5 a backwash arm 15 and for the lower filter cartridge 7 a backwash arm 17 provided, each of the three backwash 21 having. In the embodiment shown, the backwash arms 15 and 17 at an axial distance from each other and offset by 180 ° radially to each other on a drive shaft 23 arranged, whose upper end in a rotary bearing 25 on the upper housing cover 27 of the housing 1 as well as at a lower pivot bearing 29 is rotatably mounted. At this is the open end of the drive shaft 23 formed by a pipe with a mud drain pipe 31 in conjunction with a motorized backwash valve 33 which is the drain pipe 31 locks during filter operation of the device and releases for a backwash. For the rotary drive is the hollow drive shaft 23 on the upper pivot bearing 25 with the gearbox 35 a not shown electric geared motor coupled.

In the filtration mode, this flows via the fluid inlet 13 fed unfiltered through the input filter 11 and the input side 9 in the interior of the filter cartridges 5 and 7 , flows through the filter material during the filtering process 19 towards the outside and passes over the filtrate outlet 3 out. When backwashing, with the backwash valve open 33 takes place, moves the rotated drive shaft 23 the backwash arms 15 and 17 , In this case, the backwashing 21 with at their free end face 37 located, gap-shaped openings 39 without spacing on the inside of the filter material 19 the filter cartridges 5 . 7 past. The gap-shaped passages 39 form at the backwash organs 21 the entrance of her with the tubular drive shaft 23 connected, internal flow space. With the backwash valve open 33 lies at the slot nozzle-like openings 39 the pressure difference between the system pressure of the filter cartridges 5 . 7 surrounded filtrate side and the pressure in the drive shaft 23 on, for example, corresponds to the ambient pressure. At this pressure difference, which is for example in the range of 1.5 bar at the usual system pressure, loosen at the slot nozzle-like passage openings 39 deposited particles, pass through the inner flow space of the backwashing 21 in the drive shaft 23 and from this via the drain pipe 31 outward. Instead of the ambient pressure can by means of a suction fan (not shown) in the drive shaft 23 a negative pressure generated.

The 2 and 3 show the geometry of the inner flow space 41 in the embodiment of 1 provided backwashing 21 , of which on the rinsing arms 15 and 17 three backwashing devices each 21 vertically superposed so mounted that their passage openings 39 join each other and one over the entire height of the inside of the filter material 19 form extending gap.

The 2 to 4 show the geometry of the flow spaces 41 the example of 1 used backwashing 21 , Like from the 3 it can be seen in which the horizontal section of the flow space 41 in the plane of the passage opening 39 is shown perpendicular plane extending the flow space 41 continuously from the inlet 39 starting in the direction of the drive shaft 23 connected output 43 , where the side walls 45 of the flow space 41 diverge planar to each other. The course of the upper and the lower boundary wall is the 2 removable. As shown, the upper boundary wall has 47 , from the upper end of the passage opening 39 starting, a straight-line oblique course in the direction of the lower boundary wall 49 in the direction of the passage opening 39 vertical horizontal plane has a flat course. Upper and lower boundary wall 47 and 49 close the in 2 α1 angle with each other, which in the present example is 38 °. At one in 2 With 51 designated crossing point, which is at a distance from the exit 43 is located, the upper boundary wall goes 47 from the oblique course to one to the lower boundary wall 49 parallel course over, so between transition point 51 and exit 43 a starting pipe 52 is formed. In the example shown, the distance between transition point corresponds 51 and exit 43 about the diameter of the exit tube 52 , The latter has in the example shown a diameter of 21 mm at a gap height of the passage opening 39 from 80 to 120 mm and a gap width of 0.5 to 10 mm. The divergence of the sidewalls 45 is advantageously in a range of 4 ° to 8 °. In this example, an angle of 5.3 ° is provided for this purpose. As the 4 shows, have the boundary walls 45 at the entry point 53 the gap-shaped passage opening 39 a rounding 54 on. As the 2 shows are in the flow space 41 , from the passage opening 39 starting, two wing-like flow guide 55 and 56 provided, extending between the side walls 45 towards the exit 43 extend. In this case, extending from the middle of the passage opening 39 upwardly offset flow guide 55 over about a quarter of the length of the flow space measured in the radial direction 41 while the lower flow guide 56 which is slightly below the middle height of the passage opening 39 starts, has a shorter length.

The 5 shows a second embodiment of the filter device according to the invention. This corresponds to the first embodiment, except that on the drive shaft 23 for every filter element 5 and 7 two backwash valves each 21 are arranged one above the other, their inner flow spaces 57 one opposite the shape of the flow spaces 41 of the first example have a different shape. The backwash organs 21 the example of 5 and the geometry of their flow spaces 57 are in the 8th to 11 shown in more detail. As the 8th and 9 show the backwash 21 In this example, the shape of a body with two flat side surfaces 58 extending from both, to the long sides 59 the free end face 37 away in the gap-shaped passage opening 39 parallel planes to the exit 43 extend, with the width of the side surfaces 58 in two stages 60 and 61 to the exit 43 decreased. While in the first example, the upper boundary wall 47 and the lower boundary wall 49 of the inflow funnel starting from the passage opening in a straight course to the exit 43 extend in the second example, both boundary walls 47 and 49 a similar parabolic course, s. especially 6 , As indicated there, an expansion of the inflow funnel results in this course, which corresponds to an opening angle α2, which corresponds to 63 ° in the present example. The ratio of the gap height to the gap width of the passage opening 39 is in this embodiment 61 , As in the first example, the sidewalls diverge 45 from the passage opening 39 to the exit 43 with an angle that is 6 ° in the example shown. As in the first embodiment, the area ratio of gap entrance of the passage opening 39 to channel exit at the exit 43 in the range of 0.2 to 2.0 and in this example is 0.7. Also in accordance with the first embodiment is the ratio of the width of the gap-shaped passage opening 39 to the free diameter of the tubular or channel-shaped section at the exit 43 , ie at the transition to the internal fluid guide of the drive shaft 23 , in the range between 0.05 to 0.5 and in the example shown is 0.1.

Another difference compared to the first embodiment is that in the flow space 57 three flow guide 55 . 56 are arranged. Of these, the first flow guide body 56 centered on the axis of symmetry between the boundary walls 47 and 49 is located, a greater length than the two other flow guide 55 located in the area between the middle flow guide 56 and the upper boundary wall 47 and in the area between lower boundary wall 49 and the middle flow guide 56 are arranged. The same shaped shorter flow guide 55 extend with the adjacent boundary wall 47 . 49 facing concave curvature in such an arrangement that extends to the flow space 57 gives a symmetrical cross-sectional shape, wherein the tapered inner ends 63 the flow guide 55 from the adjacent boundary wall 47 respectively. 49 at a closer distance than the rounded noses 65 , in turn, at the passage opening 39 the same distance from the rounded nose 65 the middle flow guide 56 own, s. 6 ,

The 13 and 14 show for the embodiment of 5 provided backwashing 21 a flow space 67 slightly modified geometry. In contrast to the example described above are upper boundary wall 47 and lower boundary wall 49 not parabolic, but have a straight course. In symmetrical adapted to this way have the shorter flow conductors 55 no curved course, but a straight shape, wherein the positional arrangement is the same as in the example described above. The angle and area ratios correspond to those of the example described above.

The 15 shows a further embodiment of the filter device according to the invention. For every filter insert 5 and 7 are four backwash organs 21 provided on top of each other, which essentially the backwash 21 of the 8th to 11 correspond, so the flow space shown there 57 with parabolic boundary walls 47 . 49 and with three flow guide bodies 55 . 56 correspond. In the example of 15 these are backwash organs 21 However, part of a common receptacle housing 69 , the how 16 more clearly shows, from an upper half of the case 71 and a lower housing half 73 each one is the output 43 for two backwashing devices 21 form. The 17 and 18 show a modification of this embodiment, wherein the receiving housing 69 the shape of a drive shaft formed on the outside of the preferably by a square tube 23 attachable strip body 75 owns, in the slide-in channels 77 are formed in the backwash 21 can be used in the form of interchangeable insert bodies, s. 18 in which a backwash organ 21 is shown before insertion. As an insert body corresponds to the outer shape of the backwashing 21 , as in 18 shown essentially the outer shape of the in 8th to 11 shown backwash 21 Apart from the fact that the narrow sides are simply stepped. While in the example of 17 and 18 the flow spaces the geometry of the flow space 57 (S. 3 ), as an insert body in the insertion channels 77 of the receiving housing 49 Rückspülorgane 21 with the differently shaped flow spaces 41 or 67 be installed.

While in the 1 . 5 and 15 for every filter element 5 and 7 only one backwash arm each 15 respectively. 17 on the drive shaft 23 is provided, different arrangements are possible. The 19a to 19d show examples of possible designs. As in 19a . 19b and 19d are shown for a respective filter cartridge 5 or 7 more than one backwash provided, of which in the example of 19a every three backwash organs 21 having in juxtaposed arrangement. In 19b are also two backwash arms for each filter cartridge 5 . 7 each backwash arm has three backwash members spaced apart from one another 21 and wherein the backwashing 21 of a backwash each on the gaps between the backwash 21 of the other backwash arm are aligned. As 19c shows is for each filter cartridge 5 . 7 only provided a backwash, in the six backwash 21 are provided in adjacent arrangement. The 19d turn shows for each filter cartridge 5 . 7 two Rückspülarme, of which the right-hand in the figure two backwash 21 has, which is at the height of a gap between two upper backwash 21 and two lower backwash members 21 of the other backwash arm. The 20a to 20c show examples of possible distributions of backwash arms 79 over the turning circle 81 ,

The filter device according to the invention can be used in addition to the lubricating oil filtration for other applications for which it is suitable. In addition to the already mentioned maritime use, in the ballast water of Ships is cleaned, the device can also be used for the treatment of process waters.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3443752 A1 [0002]

Claims (16)

Filter device with a filter housing ( 1 ) with a fluid inlet ( 13 ) for unfiltered and with a fluid outlet ( 3 ) for filtrate and at least one in the filter housing ( 1 ) received one or more parts filter cartridge ( 5 . 7 ), which is equipped with at least one backwash element ( 21 ) can be cleaned in countercurrent to the filtration direction, which by means of a fluid-carrying drive shaft ( 23 ) of a rotary drive ( 35 ) on the inside ( 19 ) of the respective filter insert ( 5 . 7 ) is movable and at its inner side ( 19 ) adjacent end a gap-shaped passage opening ( 36 ) which is parallel to the axis of rotation of the drive shaft ( 23 ) and in one with the drive shaft ( 23 ) fluidly connected flow space ( 41 ; 57 ; 67 ), which extends in a plane in which the passage opening ( 39 ), in the direction of the drive shaft ( 23 ) at least partially continuously tapered, characterized in that in a further plane transverse to the one plane, the flow space ( 41 ; 57 ; 67 ) starting from the passage opening ( 39 ) in the direction of the drive shaft ( 23 ) extended at least partially continuously. Filter device according to claim 1, characterized in that in one plane, the flow space ( 41 ; 57 ; 67 ) continuously tapers in the manner of an inflow funnel. Filter device according to claim 1 or 2, characterized in that, starting from the gap-shaped passage opening ( 39 ), in the one plane at least - a boundary wall ( 47 ) of the inlet funnel obliquely and another boundary wall ( 49 ) even running, - two boundary walls ( 47 . 49 ) oblique and rectilinear, - two boundary walls ( 47 ; 49 ) with parabolic course and - a boundary wall obliquely and rectilinearly and the other boundary wall are formed curved. Filter device according to one of the preceding claims, characterized in that in the direction of the fluid connection of the flow space ( 41 ; 57 ; 67 ) to an internal fluid guide of the drive shaft ( 23 ) the respective flow space ( 41 ; 57 ; 67 ) with its boundary walls ( 45 . 47 . 49 ) into a tubular or channel-shaped section ( 52 ), in which the boundary walls ( 45 . 47 . 49 ) have a straight course. Filter device according to one of the preceding claims, characterized in that in the further plane of the flow space ( 41 ; 57 ; 67 ) from the gap-shaped passage opening ( 39 ) in the direction of the internal fluid guide of the drive shaft ( 23 ) conically with rectilinear boundary walls ( 45 ) expanded. Filter device according to one of the preceding claims, characterized in that the flow space ( 41 ; 57 ; 67 ) at its exit from the backwash element ( 21 ) in the direction of the respective filter insert ( 5 . 7 ) at least one rounding ( 54 ) at the boundary walls ( 45 ) of the gap-shaped passage opening ( 39 ) which is parallel to the axis of rotation of the drive shaft ( 23 ) runs. Filter device according to one of the preceding claims, characterized in that the area ratio of column entry to channel exit ( 43 ) is in the range of 0.2 to 2.0, preferably 0.3 to 1.0. Filter device according to one of the preceding claims, characterized in that the extension of the slot-shaped passage opening ( 39 ) from the height to its width in the range of 10 to 100, preferably in the range of 30 to 70, lies. Filter device according to one of the preceding claims, characterized in that the ratio of the width of the slot-shaped passage opening ( 39 ) to the free diameter of the tubular or channel-shaped portion ( 52 ) at the point of transition to the internal fluid guide of the drive shaft ( 23 ) is between 0.05 to 0.5. Filter device according to one of the preceding claims, characterized in that within the flow space ( 41 ; 57 ; 67 ) wing-like flow guide bodies ( 55 . 56 ) are introduced, which from the gap-shaped passage opening ( 39 ) away in the direction of the channel exit ( 43 ) at least partially extend. Filter device according to one of the preceding claims, characterized in that at least a part of the flow guide body ( 55 . 56 ) have a curved or straight course and are continuous between the boundary walls ( 45 ) of the backwash element ( 21 ), which are parallel to the axis of rotation of the drive shaft ( 23 ). Filter device according to one of the preceding claims, characterized in that at least one flow guide ( 55 ) starting from the slot-shaped passage opening ( 39 ) further into the flow space ( 41 ; 57 ; 67 ) protrudes as at least one further flow guide ( 55 ), and that the further projecting flow guide ( 56 ) preferably in the middle of the gap opening of the passage opening ( 39 ) lying down from this in Direction of the interior of the flow space ( 41 ; 57 ; 67 ) extends away. Filter device according to one of the preceding claims, characterized in that the fluid guide within the flow space ( 41 ; 57 ; 67 ) from the column entry to before the channel exit ( 43 ) without deflection of the total flow of the backwash. Filter device according to one of the preceding claims, characterized in that the respective backwash element ( 21 ) with its one free end face ( 37 ), the inner wall of the filter material ( 19 ) of the assignable filter cartridge ( 5 . 7 ), free of spacing on this inner wall by means of the rotatable drive shaft ( 23 ) is passed. Filter device according to one of the preceding claims, characterized in that used backwashing ( 21 ) in an associated receiving housing ( 69 ) are used interchangeably on the drive shaft ( 23 ) is arranged. Filter device according to one of the preceding claims, characterized in that along the drive shaft ( 23 ) several backwash organs ( 21 ) are inserted in superposition by these - summarized in at least two groups at different circumferential positions on the drive shaft ( 23 ), preferably diametrically opposite each other to the axis of rotation ( 19a ), - in a group exclusively on one side of the drive shaft ( 23 ) ( 19c ), or - in alternating sequence on opposite sides of the drive shaft ( 23 ) are arranged ( 19b ; 19d ).

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